//
// Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
//
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// modification, are permitted provided that the following conditions
// are met:
//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//  * Neither the name of NVIDIA CORPORATION nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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//


#pragma once

#include <iosfwd>
#include <string>
#include <sutil.h>


//-----------------------------------------------------------------------------
//
// Utility functions
//
//-----------------------------------------------------------------------------

// Creates a TextureSampler object for the given PPM file.  If filename is
// empty or PPMLoader fails, a 1x1 texture is created with the provided default
// texture color.
SUTILAPI sutil::Texture loadPPMTexture( const std::string& ppm_filename, const float3& default_color, cudaTextureDesc* tex_desc );

//-----------------------------------------------------------------------------
//
// PPMLoader class declaration
//
//-----------------------------------------------------------------------------

class PPMLoader
{
  public:
    SUTILAPI PPMLoader( const std::string& filename, const bool vflip = false );
    SUTILAPI ~PPMLoader();

    SUTILAPI sutil::Texture loadTexture( const float3& default_color, cudaTextureDesc* tex_desc );

    SUTILAPI bool           failed() const;
    SUTILAPI unsigned int   width() const;
    SUTILAPI unsigned int   height() const;
    SUTILAPI unsigned char* raster() const;

  private:
    unsigned int   m_nx;
    unsigned int   m_ny;
    unsigned int   m_max_val;
    unsigned char* m_raster;
    bool           m_is_ascii;

    static void getLine( std::ifstream& file_in, std::string& s );
};
